犁沟
6.a long narrow furrow or channel cut by a natural process (such as erosion) or by a tool (as e.g. a groove in a phonograph record).
9.The wild boar ploughs the earth up like a furrow,and does irreparable damage in the cultivated lands.

10.a farm tool having one or more heavy blades to break the soil and cut a furrow prior to sowing.

